Finding the Fourth Proportional to 2,259.15, 3,117.80 and 1,315.23

Step by Step Solution

1. Step 1: Write the proportion equation
   2,259.15 : 3,117.80 = 1,315.23 : x
2. Step 2: Convert to fraction form
   2,259.15/3,117.80 = 1,315.23/x
3. Step 3: Cross multiply
   2,259.15x = 3,117.80 × 1,315.23
4. Step 4: Simplify right side
   2,259.15x = 4,100,617.52
5. Step 5: Solve for x
   x = 4,100,617.52/2,259.15
6. Step 6: Final answer
   x = 1,815.12